Mortising-machine.



G. W. CAMPBELL.

MORTiSlNG MACHINE.

APPLICATION FILED AUG.8,19H.

1,149,629. Patented Aug. 10, 1915.

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GEORGE W. CAMPBELL, OF COLUMBUS, OHIO, ASSIGNOR, BY MESNE ASSIGNMENTS, TO

THE PERFECTION MORTISE MACHINE COMPANY, OF COLUMBUS, QHIO, A CORPORA- TION OF OHIO.

Application filed August 8, 1911.

lin and State of Ohio, have invented certain new and useful Improvements 1n Mortismg- Machines, of which the following is a specification. w

This invention relates to improvements in mortising machines, and more particularly to the machine described in my Letters-Pat ent #921,795, issued May 18th, 1909.

An object of my invention is to simplify and make moreeffective the operation of the machine, particularly with respect to preventing the cutting tool from drawing into the wood under certain conditions of the work and also to permit the use of the machine in end down position.

Another object is to improve the construction of the cutting tool.

In the accompanying drawings: Figure 1- is a longitudinal sectional view of a machine embodying my improvements. Fig. 2 is a side elevation of the same with some of the parts broken away. Fig. 3 is atransverse section on the line 50-00 of Fig.2. Fig. 1

- is a side view of the cutting tool.

Like parts are represented by similar characters of reference in the several views.

In said drawings, 1 represents the main frame, arranged to be clamped to thework by the clamping members 2 and 3.

a is the usual driving wheel journaled on the main frame; 5 is the offset beveled gear integrally formed on said wheel; 6 is a pinion mounted in the tool-carrying sleeve 7 said sleeve being pivoted at its rear end to the main frame through the L-shaped arm 8 which forms the support for said tool-carrying sleeve. This tool-carrying sleeve is pivoted concentrically to the main driving wheel 4: and is formed at its forward end with a housing9 within which said pinion 6 v Specification of Letters Patent.

MORTISING-MACHINE.

Patented Aug. 10,1915.

Serial No. 642,976.

vided with a key-way 13 into which projects a key on the p nion 6 so that the said shank will revolve with'the main operating wheel 1 but is capable of a sliding longitudinal movement independent thereof.

14 is theoscillatory head described in the patent .pivotally connected to the main frame by the screw-threaded stud 15 and having a slotted opening 16, which receives the device for oscillating thehead. The 0scillating device shown herein is the same as that described in my pending application Ser. No. 576,097 filed August 8th, 1910 and consists of a square block 17 fitted in the slot 16 and pivotally mounted upon the pin 18 by the headed screw 19; this pin projecting from the slide 20, fitted in recess formed in the side of the crank-head 21. The other side of the crank head has a stud 22 journaled in the main frame, said stud having a reduced screw-threaded portion which is secured into the hub of the gear 28, so that as said gear is revolved an oscillatory movement will be imparted to the head 14. Means are provided for adjusting the slide 20 in the crank head, but-as this is described in said pending application it is not'deeined necessary to go into the details of this construction here.

The block 12 which carries the rear end of the tool shank 11 is slidingly connected to the head 1% through the medium of a headed screw 24, which projects through a slotted opening 25 in said head and is secured in a stud 26 on a sleeve 27, which stud is journaled in the block 12. Located in the sleeve .a spirally-arranged groove 29, the pitch of which gradually decreases from the rear to front for the purposehereinafter explained. Pivotally connected to ears 27 on the respective sides of the sleeve 27 is a pair of followers, 80 and 31, which are in the nature of arms, theforward end of each of which has aninturned finger 32 which fits in the spiral groove 29. Said fingers are held in said groove by a spring 35 connected to the forward ends of'the respective followers, but may be-removed therefrombyxtheoperator at any, time by simply pressingthe rear ends of the followers inwardly toward each other. The ear 27 is provided with an elongated slot 27 to receive the pivot pin 30 of the follower 30 so that the respective followers can adjust themselves relatively to each other to compensate for the variation in the spiral.

The spirally-grooved shaft forms the means for feeding the tool forwardly upon each oscillatory movement of the head and to accomplish this the rear end of the shaft is provided with a series of projections 34, preferably three in number, adapted to al ternately contact witlrpins 33 which project forwardly from the rear portion of the main frame 1; these pins being located on the opposite sides of the longitudinal center of the machine and also on opposite sides of the frame 1 as shown bestvin Fig. 3. As the head 14 oscillates, one of the projections 34 will contact one of the pins 33 at the end of each oscillatory movement of the head, and thus impart to the shaft 28 one-sixth of a turn. This movement of the shaft 28 will cause the tool carrying block 12 to be fed forwardly, through the medium of the follower 31, the feeding movement of this block gradually decreasing due to the decreased pitch of the spiral groove. This slower feed of the tool is desirable, as explained in my former application referred to, for the reason that when no provision is made for reducing the feed, as in my former machine, the farther the tool feeds into the work the more vibration there will be due to the fact that dowel pins and the ends of panels are apt to be encountered which causes a greater strain on the machine; it being understood that the less the feed the less work will be brought upon the tool by reason of reducing the thickness of the cut.

The particular point of advantage in the use of the spiral groove over the feeding pawls described in my former patent, is that the tool will be prevented from drawing into the work, as some times happens in the use of the pawls due to the fact that thepawls exert no holding back effect upon the tool. Another advantage is that the machine may be used in end down position for the reason that the engagement of the fingers of the followers with the groove will prevent the block 12 and consequently the tool from dropping by gravity when the machine is held in a vertical position; it being understood that in my former patent referred to the weight of the tool and this block would over-come the spring pressure of the pawls and thus permit the tool to drop by gravity when the machine was attempted to be used in a vertical position.

lVhile I have preferably shown two of the followers, 30 and 31, as a matter of fact a single follower will answer the purpose of feeding the tool, the second follower being employed more for the purpose of insuring the maintenance of the grooved shaft in alinement with the sleeve through which it extends to prevent binding in case of an inaccurate fit between the shaft and the sleeve.

The pins 33 are adj ustably mounted in the frame 1 so that they may be adjusted to correspond with the oscillatory movement of the head 14 as determined by the adjustment of the block 17 For this purpose I provide the rear end of the frame with a slotted opening 36. Each of the pins 33 is formed integrally with a plate 37 which has a screwthreaded shank 38 which extends through the slotted opening 36 and receives a thumbnut 39 so that the said pins 33 may be clamped to the frame in any position of adjustment.

As in my former patent referred to, the gear 23 is driven from the driving wheel 4 through the medium of the pinion 52, intermediate gear 53 and pinion 54.

Having thus described my invention, I claim:

1. A mortising machine, a main frame, a cutting tool, means for rotating said tool, a pivoted oscillating device for said tool, a carrier for said tool, a spirally-grooved shaft carried by said oscillating device, projections on the end of said shaft, adjustable pins on said frame arranged in the path of movement by said projections whereby a 1'0- tary movement is imparted to said shaft upon each oscillatory movement of said oscillating device, and a device having a connection with said carrier and engaging with the groove of said shaft whereby each movement of said shaft imparts a feeding movement to said carrier, substantially as speci- I 2. In a mortising machine, a cutting tool together with means for rotating said tool, a pivoted oscillating device for said tool, a carrier for said tool, a spirally-grooved shaft together with means for imparting to said shaft rotary movement upon each oscillatory movement of said oscillatory device, a device engaging with the groove of said shaft and having a connection with said carrier whereby each rotary movement of said shaft imparts a feeding movement to said carrier, the pitch of the forward part of the groo e of said shaft being less than that of the rear part to decrease the feeding movement of said carrier, substantially as specified.

3. In a mortising machine, a cutting tool together with means for rotating said tool, a pivoted oscillating device for said tool, a carrier for said tool, a spirally-grooved shaft together with means for imparting to said shaft a rotary movement upon each oscillatory movement of said oscillating device, a device engaging with the groove of said shaft and having a connection with said carrier whereby each rotary movement of said shaft imparts a feeding movement to said carrier, the pitch of the groove of said shaft being gradually decreased from rear to front to gradually decrease the feeding movement of said carrier, substantially as specified.

4. In a mortising machine, a cutting tool, means for rotating said tool, a pivoted oscillating device for said tool, a carrier for said tool, a spirally-grooved shaft carried by said oscillating device so as to be oscillated thereby, means arranged at the end of the 0s cillatory movement of said shaft in each direction for imparting to said shaft intermittent rotary movements, and a device connected With said carrier and engaging with the groove of said shaft whereby the rotary 15 GEORGE WV. CAMPBELL.

WVitnesses:

CHAS. 1. Hanan, OLIVER T. CLARKE.

Copies of this patent may be obtained for five cents each. by addressing the Commissioner of Patents, Washington, D. C. 

